The .pcp file is completely useless when exporting to Autocad. Not even Autocad uses .pcp files anymore. Not even .ctb files are used very often. Autocad uses stb files.
Revit already exports object lineweights in the dwg file. I use Autocad lineweights when i'm plotting on paper. It doesn't matter what Plot Style Table i'm using (either ctb or stb). What use do i have for the pcp file?